After investing so heavily in their attack over the summer, with Benjamin Sesko, Bryan Mbeumo and Matheus Cunha all arriving, United management now plan to focus on the defence.
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ESPN says £200m is being put aside to rebuild the back four and add defensive depth.
The move is expected to see Harry Maguire allowed to depart as his contract runs down this season.
It is suggested United could kickoff their plans during the January market, though their main activity is planned for the summer.